you completed stormblood (4.0) msq or the whole msq up to 4.58?

Well it totally, entirely, depends on you, how you continue your story in this game is decided by you, there are plenty of things to do, from doing optional questlines, secondary quests, gathering, crafting, raiding, stuff farming, beast tribes, godl saucer, hunts, achivement hunting, wealth run, housing, entertaining, social, pvp, roleplaying... wow so many

So you may want to try out as many things as possible and then see which one captures your attention and curiosity the most. If you need an introduction for each content, you may simple make a quick research on the web, you are likely going to find some text informations or video presentation, stuff like these.

Welcome back!